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Intestinal Transcriptomes in Kazakh Sheep with Different Haplotypes After Experimental Echinococcus Granulosus Infection

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Intestinal Transcriptomes in Kazakh Sheep with Different Haplotypes After Experimental Echinococcus Granulosus Infection Parasite 28, 14 (2021) Ó X. Li et al., published by EDP Sciences, 2021 https://doi.org/10.1051/parasite/2021011 Available online at: www.parasite-journal.org RESEARCH ARTICLE OPEN ACCESS Intestinal transcriptomes in Kazakh sheep with different haplotypes after experimental Echinococcus granulosus infection 1,2,a 2 2 2, Xin Li , Song Jiang , Xuhai Wang , and Bin Jia * 1 College of Life Sciences, Shihezi University, Road Beisi, Shihezi 832003, Xinjiang, PR China 2 College of Animal Science and Technology, Shihezi University, Road Beisi, Shihezi 832003, Xinjiang, PR China Received 8 October 2020, Accepted 4 February 2021, Published online 5 March 2021 Abstract – Cystic echinococcosis (CE) is a chronic zoonosis caused by infection with the larval stage of the cestode Echinococcus granulosus. As the intermediate host, sheep are highly susceptible to this disease. Our previous studies have shown that sheep with haplotype MHC Mva Ibc-Sac IIab-Hin1I ab were resistant to CE infection, while their counterparts without this haplotype were not. In order to reveal the molecular mechanism of resistance in Kazakh sheep, after selecting the differential miRNA in our previous study, herein, transcriptome analyses were conducted to detect the differential expression genes in the intestinal tissue of Kazakh sheep with resistant and non-resistant MHC haplotypes, after peroral infection with E. granulosus eggs. A total of 3835 differentially expressed genes were identified between the two groups, with 2229 upregulated and 1606 downregulated. Further function analysis showed that the most significant genes were related to both innate immune response and adaptive response participating in the defense against E. granulosus infection and the metabolic changes associated with it. The results suggest that genes related to lectin receptors, NK cells activation, chemokines, and tumor necrosis factor, may play important roles in the response of intestinal tissue to E. granulosus. Key words: Differentially expressed genes, Disease resistance, Echinococcus granulosus, Intestinal tissue, Transcriptome analysis. Re´sume´ – Transcriptomes intestinaux chez des moutons kazakhs de différents haplotypes après une infection expérimentale avec Echinococcus granulosus. L’échinococcose kystique (EK) est une zoonose chronique qui est causée par une infection au stade larvaire du cestode Echinococcus granulosus. En tant qu’hôte intermédiaire, les moutons sont très sensibles à cette maladie. Nos études précédentes ont montré que les moutons avec l’haplotype MHC Mva Ibc-Sac IIab-Hin1I ab étaient résistants à l’EK, alors que leurs homologues sans cet haplotype ne l’étaient pas. Afin de révéler le mécanisme moléculaire de la résistance chez le mouton kazakh, après avoir sélectionné le miARN différentiel dans notre étude précédente, des analyses de transcriptome ont été menées dans ce travail pour détecter les gènes d’expression différentielle dans le tissu intestinal de mouton kazakh avec des haplotypes MHC résistants et non résistants, après une infection pérorale par des œufs d’E. granulosus. Un total de 3835 gènes différentiellement exprimés ont été identifiés entre les deux groupes, avec 2229 régulés à la hausse et 1606 à la baisse. Une analyse fonctionnelle plus poussée a montré que les gènes les plus significatifs étaient liés à la fois à la réponse immunitaire innée et à la réponse adaptative participant à la défense contre l’infection à E. granulosus et aux changements métaboliques qui y étaient associés. Les résultats suggèrent que les gènes liés aux récepteurs de la lectine, à l’activation des cellules NK, aux chimiokines et au facteur de nécrose tumorale peuvent jouer un rôle important dans la réponse du tissu intestinal à E. granulosus. Introduction E. granulosus is complex and involves two hosts: definitive and intermediate. Infection with E. granulosus occurs after oral Cystic echinococcosis (CE), a zoonotic disease caused by ingestion of infective eggs (an oncosphere containing the inva- Echinococcus granulosus, poses a great threat to the health of sive hexacanth [9]). The hexacanth then hatches in the small humans and domestic animals [51]. The life cycle of intestine of the intermediate host, penetrates the mucosal tissue, enters the blood circulation system, and migrates to various * Corresponding author: [email protected] organs (e.g. the liver and lungs), where it develop cysts filled a Institutes 1 and 2 contributed equally. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 2 X. Li et al.: Parasite 2021, 28,14 with fluid and protoscoleces [6]. However, in definitive hosts Transcriptome sequencing aims at the set of all transcripts, like dogs, adult parasites develop from the protoscolex in the including mRNAs, rRNA, tRNA, and other noncoding RNAs, intestine. In domestic animals, especially in sheep, which produced in one or a population of cells in a specific develop- appear to be highly susceptible to infection [38], CE causes mental stage or physiological condition [13]. In the present considerable health problems and thereby significantly affects study, using high-throughput transcriptome sequencing, we the income of herders [32]. screened a number of differential genes in the small intestinal Echinococcus granulosus infection in the host is a complex tissue of Kazakh sheep after infection with E. granulosus.In dynamic process, which involves the recognition and interac- terms of their functions, we concluded that innate immune tion of a variety of biological molecules, including genes response plays the first defense role in CE resistance in sheep. [33], proteins [1], and miRNAs [42]. Upregulation or downreg- In addition, adaptive immune response played an important role ulation of molecular expression likely causes different individ- in defense against E. granulosus infection. Moreover, our study uals of the same host to have different resistance, similarly to revealed that metabolic changes contribute to defense against reports about Plasmodium homocircumflexum [17]. It is very E. granulosus infection. These findings laid the foundation important to understand the interaction mechanisms between for a discussion of the molecular mechanism of Kazakh sheep the host and the parasite. Research and discussions about these resistance to E. granulosus. mechanisms will help to determine the key factors of immune regulation in the host from the perspective of molecular biol- ogy, and further explore the mechanism of disease resistance. Materials and methods This research will also provide new ideas for mining molecular Ethics statement markers of disease resistance and directional genetic breeding [19]. This study was performed in strict compliance with the rec- Previously, we carried out a series of studies to research the ommendations of the National Institutes of Health guideline for relationship between MHC polymorphisms and resistance or the care and use of laboratory animals (NIH Publication susceptibility to CE in native Chinese sheep, including Chinese No. 8023, revised 1978), and the Animal Care and Use Com- Merino [21], Duolang [28], and Kazakh sheep [29]. Our previ- mittee of Shihezi University approved all procedures and exper- ous studies indicated that in Kazakh sheep, when exposed to the iments (Approval No. A2018-138-01). Local strain dogs and same number of parasites, the rate of E. granulosus infection in Kazakh sheep were purchased from farmers around Shihezi the internal organs of sheep with haplotype MHC MvaI city. The farmers gave oral consent for the use of their animals bc-SacII ab-Hin1I ab haplotype was significantly lower than in this research after they were provided with explanations in sheep without this haplotype. Statistical results and analysis about the purpose of the research and on efforts to ensure the showed that sheep with this haplotype have an increased welfare of animals. genetic capability to respond to and subsequently reject E. granulosus when infected. The haplotype MHC MvaI bc-SacII ab-Hin1I ab was therefore identified as a genetic mar- Animals and experimental design ker of CE resistance in Kazakh sheep [29]. Afterwards, studies were conducted to reveal the mecha- The preparation method of the experimental materials was nism of CE resistance in Kazakh sheep, and most of our similar to previous research reports [22]. Since no studies have research was focused on intestinal tissue. It has been found that shown that the CE resistance of sheep is related to sex, 2-year- when sheep were infected with oncospheres (larvae of old Kazakh ewes with CE-resistant [MvaIbc-SacII ab-Hin1I ab E. granulosus), the small intestine tissue was the first mucosal (R)] and CE-non-resistant [MvaIbc-SacIIab-Hin1Iab (NR)] immune barrier that must be passed through, where various haplotypes were selected, as described previously, and raised antibodies, cytokines, and other immune molecules are on the farm of Shihezi University. All animals were raised expressed in response to exogenous stimuli [12]. These mole- under the same conditions of free access to water and food, cules could be involved in stopping larval growth of E. granu- in natural lighting. They were divided into two groups accord- losus at the very first stages [11, 21, 28, 29]. Hence, we were ing to their MHC haplotype: three sheep with the CE-resistant interested
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